Fertility is the ability of an organism to produce offspring, while developmental time refers to the duration required for growth and maturation. In the present study, Drosophila melanogaster were cultured in wheat cream agar media supplemented with 10g, 20g, and 30g of muesli to evaluate the effect of muesli on fertility. The flies reared in 10g muesli media showed comparatively lower fertility than those raised in 20g and 30g media. Among all treatments, the 30g muesli media supported the highest fertility, whereas the control wheat cream agar media showed the lowest reproductive rate. These observations indicate that nutritional enrichment through muesli supplementation can influence the fertility and developmental performance of D. melanogaster.